Oldest surviving milestone in Europe outside of the Roman Empire.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

This now-defunct synthetic fuel plant was once a major cog in the Nazi war machine.

A stone in Wolin, Poland, marks the possible location of a legendary Viking fortress.

A modern-day Polish explorer's collection of artifacts from around the world

How did this desert wind up in the middle of a Polish forest?

This statue is said to bring good luck to visiting lovebirds.

An artificial date palm stands as a memorial to Warsaw's Jewish community.

These rare statues are one of the few remaining material witnesses to Old Prussian culture.

The home of the morbid art of corpse plastination is open for visitors to view the fascinating, but stomach-churning process.

What was once an underground Nazi city is now Europe's largest bat reserve.

These abundant, over-the-top monuments are so widely scattered that they define the entire compact capital cityscape, often leading to jokes about whether there are more statues than residents.

Monasteries on rock pillars, once accessible only by frayed ropes.

Countless stories attempt to explain Poland's mysterious J-shaped trees.

This public park collects signposts and other memorabilia related to local history, Polish-German relations and human progress

An installation at the border commemorates a battle from 972.

One of the largest and most ornate abbeys in this part of Europe.

The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

This mysterious and once-grand memorial still embodies a remarkable architectural vision.

Relive a Polish uprising via an enormous, century-old cyclorama.

The largest toy museum in Poland showcases Europe's history of childhood.

The silly symbol for an underground protest group is now scattered around the city.

A striking public sculpture representing the period of martial law in Communist Poland.

This towering statue of Jesus provided internet to the surrounding area.